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Duo has been upgraded to Meet as your one app for video calling and meetings. Learn more.

Preview video calls with Knock Knock

When you call someone using Duo, the other person can see live video of you while their device rings if they have you as a contact. You won't be able to see the person you're calling until they answer.

Important: Knock Knock is available for Google Duo 1:1 and group video calling. Knock Knock isn't available when you join a meeting in the Duo app. Learn more about changes to Google Duo.

Turn on Knock Knock

  1. On your Android phone or tablet, open the Duo app Duo.
  2. In the top right corner, tap More options More and then Settings and then Knock Knock.
  3. Turn on Knock Knock.

Can't see video preview for incoming call

If you can't see a video preview when someone calls you, the other caller has Knock Knock turned off or they're not in your contacts.

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